Crustaceans (5)
'crustaceans' is the definition.
(I know this)
This is all the clue.
(Another definition for crabs that I've seen is " Marine crustaceans".)
'crustaceans' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for shellfish that I've seen before include "provider of pearls?" , "Lobsters, cockles, mussels etc" , "A shrimp, maybe" , "Category of seafood" , "Oysters, crabs, shrimps etc" .)